Carrying scraper



Aug. 12, 1947. P. ZAKEL CARRYING SCRAPER Filed Ju1y l0, 1945 5 Sheets-Sheet 1 A INVENTOR Pau Z Zakel ATTORNEYS Aug. 12, 1947. P. ZAKEL CARRYING SGRAPER Filed July 10; 1945 s Sheets-Shae 2 INVENTOR v 7 Paul Zeke!- ATTORN 8Y5 Patented Aug. 12, 1947 UNITED STATES PATIENT OFFICE CARRYING SCRAPER Paul Zakel, Stockton, Calif.

Application July 10, 1945, Serial No. 604,211

6 Claims.

This invention relates in general to earth working machines, and in particular the invention embraces improvements in carrying scrapers, especially of the type shown in the J. S. Walsh U. S. Patent No. 2,179,532, dated November 14, 1939.

One featureof the present invention is an improved mounting and power actuating assembly for the rear endgate; and the provision on the endgate of bowl scraping blades mounted in a novel manner.

An additional feature of the invention is the provision of an improved, automatically operated front apron including a transversely hinged or articulated apron unit which, when open, permits of relatively free or unobstructed loading of the bowl, yet when closed effectively prevents load loss from the forward end of said bowl.

Another feature of the invention is the embodiment, on opposite sides of the bowl, of upstanding laterally projecting blades for scraping sides of banks or the like; such blades also functioning as guards for the forward end of power cylinders mounted on the sides of the bowl to actuate the movable bottom or shovel plate thereof.

A further object of the invention is to produce a carrying scraper which will be exceedingly effective for the purpose for which it is desi ned.

These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation of a carrying scraper embodying the present invention.

Figure 2 is a plan view of the scraper.

Figure 3 is a fragmentary longitudinal elevation, partly broken away, showing the shovel plate advanced and the cooperating, articulated front apron in closed position.

Figure 4 is a fragmentary sectional plan on line A-4 of Fig. 1.

Figure 5 is an enlarged, fragmentary sectional elevation of the rear endgate mounting and power actuating assembly.

Figure 6 is a fragmentary cross section on line 6-6 Fig. 5.

Figure 7 is a fragmentary cross section online 1-! of Fig. 5.

Figure 8 is a fragmentary plan on line 8--8 of Fig. 5.

Referring now more particularly to the characters of reference on the drawings, the scraper comprises a box-like bowl, indicated generally at I, and which bowl includes elongated but rectangular side plates 2 connected at the back by means including cross beams 3. At the front the side plates are connected by a cross plate 4 extending about half way down from th top. Heavy-duty tubular top beams '5 are fixed in connection with and extend full. length of the upper edges of the side plates 2, said tubular top beams being connected at the rear of the bowl by a cross beam 6.

At the forward end, adjacent the top and centrally thereof, the bowl I is fixed in connection with a forwardly projecting, rigid draft neck I. At its forward end the draft neck I is coupled to the rear end of a tractor, indicated in part at 8, by means which includes a hydraulic lift, indicated diagrammatically at 9; said lift being operative to raise and lower the draft neck I. and consequently the forward end of the bowl.

At its rear end the bowl I is provided with a rearwardly extending, vertically swingable fram II], pivotally connected at transverse points, as at II, to the rear end of said bowl; the frame In being vertically swingable about, said pivots by means of a fluid-pressur actuated power cylinder I2 connected between the upper end of said frame and the cross beam 6 centrally of the ends thereof. At transversely spaced points the frame I0 is provided with ground engaging wheels I3 positioned so that when the frame I0 is swung in one direction or the other, it causes raising or lowering, respectively, of the bowl I at the rear end. The rear wheels It, as well as the Wheels of the tractor, have a tread no greater than the width of the bowl I.

The bowl I also includes a bottom plate I4 which extends forwardly from the rear end of said bowl to a termination intermediate the ends thereof in a short downwardly sloping apron l5. This bottom' plate I4, and the adjacent portions of the side plates 2, form a fixed dirt retaining portion of the bowl. Disposed at a level immediately below the apron I5 is a longitudinally movable bottom plate It which terminates at its forward end in a downwardly sloping scraping or earth digging blade [1 which extends the full width of the bowl. The unit of plate l6 and blade I! may be termed the movable shovel plate of the implement.

lhe plates I4 and I6 are substantially the same length, and the shovel plate It is mounted for sliding movementfrom a retracted position beneath the bottom plate [4, at which time the forward end portion of the bowlis bottomless, to an advanced position, as shown in Fig. 3, to provide a bottom for said forward portion of the 3 bowl. The shovel plate I6 is mounted for such movement as follows:

At its side edges the shovel plate I6 is formed with upturned flanges I8 which ride outside the side plates 2. Said flanges are connected, at opposite ends, by upstanding suspension plates I9 attached, at their upper ends, to horizontal, longitudinally movable rails 20 carried in guide channels 2I fixed on and extending along the side plates 2. Fluid pressure actuated power cylinders 22 extend between the forward suspension plates I9 and the cross beam 3 on opposite sides of the bowl I; said power cylinders 22 being double acting whereby to forcefully advance or retract the shovel plate I6.

The forward suspension plates I9 are formed with upstanding, laterally projecting and forwardly inclined scraper blades 23 which are useful for scraping the sides of banks or the like upon movement of the implement close alongside thereof. In addition, the blades 23 serve as forward guards for the power cylinders 22.

A novel front endgate or apron unit, indicated generally at 24, cooperates with the front end of the bowl, and comprises the following:

The apron 24 includes a transversely extending top plate 25, and a transversely extending bottom plate 26 hinged together along adjacent edges, as at '21, for forward articulating or buckling movement; rearward articulation or buckling of such hinged plates beyond dead-center being limited by a stop device 28.

The top plate 25 is secured to a turnable cross shaft 29 fixed on the partial front plate 4 of the bowl adjacent the lower edge of said plate, whereby the apron unit is swingable from the forwardly articulated position of Fig. 1, and in which position the bottom plate 26 is advanced and raised, to the unfolded, substantially deadcenter position of Fig. 3 in closing relation to the forward end of the bowl below the plate 4. When the apron unit 24 is closed and the shovel plate I6 advanced, as in Fig. 3, the forward end of the bowl is fully closed against load escape.

. The front apron unit 24 is normally urged to the articulated open position of Fig. 1 by a tension spring 30 connected between the top plate 25 adjacent the hinge 2! and an elevated point on the scraper. This spring-opened front apron unit 24 is adapted to be automatically closed as follows:

The shaft 29 is fitted, at opposite ends, with rigid, radially projecting cam levers 3| which are engaged by cooperating cams 32 projecting forward from the guard blades 23 of the forward suspension plates I9. It will thus be seen that when the shovel plate I6 is advanced by the cylinders 22, the cams 32 engage the cam levers 3|, causing rotation of the shaft 29 in a direction to swing the front apron unit '24 from the articulated open position of Fig. l to the substantially dead-center, closed position of Fig. 3, and at which latter time the shovel plate I6 is in advanced position.

The advantage of a hinged or articulated front apron unit, as above described, resides in the fact that the apron is disposed forwardly and elevated when the main bowl is loading, and, in addition, should a rock or other object be encountered by the apron, the plate 26 normally.

swings rearwardly to permit passage of the rock into the bowl I.

The scraper includes, in the bowl I, a longitudinally movable, rear endgate 33 which includes forwardly projecting vertical side flanges running in adjacent but spaced relation to the sides 2 of the bowl. The forward edges of the side flanges 34 are initially separate and are formed as upstanding scraping blades 35 hinged to the side flanges 34, as at 36. The scraping blades 34 diverge forwardly and outwardly and run in scraping engagement with the inner side walls of the sides '2. At its lower edge the endgate 33 includes a transverse scraping blade 37 which runs on the bottom plate I4.

The endgate 33 is suspended in the bowl and power actuated for longitudinal movement in said bowl, as follows:

At their upper edges the side flange 34 are extended upwardly, as at 38, and project through longitudinally extending slots in the bottom of the tubular top beams 5. Within said tubular top beams the flange extensions 38 are fixed in connection with fluid pressure actuated power cylinders 39 disposed in said beams in clearance relation thereto. The cylinders 39 are each fitted, at the forward end, with a roller 40 which rides within the corresponding tubular top beam in engagement top and bottom therewith. The power cylinders 39 each include a rearwardly projecting piston rod M which extends through a packing in the rear end of the cylinder and is thence fixedly connected through the end plate 42 of the corresponding top beam. At the rear end each cylinder 39 includes a roller assembly 43 riding the tubular top beam top and bottom. By reason of the above arrangement each piston rod M is stationary, and the jacket of the power cylinder 39 travels in a corresponding direction, upon introduction of fluid pressure into the power cylinder on one side or the other of the piston 44.

Fluid pressure is introduced into each power cylinder 39 through a pair of passages 45 extending through the piston rod from its rear end; one passage opening on one side of the piston, while the other passage opens on the other side of the piston. By reason of this arrangement fluid pressure for the control of the cylinders 39 may be introduced thereinto by non-movable conduits (not shown) connected to the read ends of the piston rods 4|. When fluid pressure is introduced into the cylinders 39 ahead of the piston 44, the cylinder jackets, together with the rear endgate 33, advance along the bowl, while introduction of pressure onto the other or rear side of the piston causes endgate retraction. Thus, the endgate may b positively and forcefully moved in either an advancing or retracting direction; the powered advance of the endgate assuring of an even and positive ejection of the load from the bowl.

No detailed explanation of the cycle of operations of the scraper is set forth in this specification, as such cycle is substantially the sam as in the above identified issued patent. Suflice it to state that when the bowl is fully loaded the shovel plate I6 is in the advanced position of Fig. 3, and at which time the front apron unit 24, cooperating with the digging blade I I, completely closes the forward end of the bowl. When the rear endgate is advanced to eject a load, the shovel plate I6 is retracted somewhat, and at which time the front apron unit 24 is open.

Vertical movement of the bowl I between a lowered digging position and a raised carrying position is accomplished through the medium of the hydraulic lift 9 and the power cylinder I2.

The hydraulic lift 9, together with the power cylinders I2, 22, and 39, are controlled through th medium of a fluid pressure supply system (not shown), but which includes operator-controlled valves adjacent the operators station on the tractor, and conduits leading rearwardly to the implement; all of which is conventional in connection with the fluid pressure actuated devices on trailing types of earth working equipment.

From the foregoing description it will be readily seen that there has been produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent is desired:

1. In a carrying scraper which includes a bowl having an initially open front end portion, and a front apron unit mounted for movement between open and closed positions relative to said open front end portion; the front apron unit including transversely extending top and bottom plates, means pivotally mounting the top plate for swinging movement about a transverse axis adjacent its upper edge, the top and bottom plates being hinged along adjacent edges for forward articulation, and means to swing the apron unit about said axis back and forth between a downwardly extended, bowl closing position and an elevated and articulated bowl opening position; said last named means including a tension spring connected between the top plate of the apron unit and an elevated point on the scraper.

2. In a carrying scraper which includes a bowl having an initially open front end portion, and a front apron unit mounted for movement between open and closed positions relative to said open front end portion; the front apron unit including transversely extending top and bottom plates, means pivotally mounting the top plate for swinging movement about a transverse axis adjacent its upper edge, the top and bottom plates being hinged along adjacent edges for forward articulation, and means to swing the apron unit about said axis back and forth between a downwardly extended, bowl closing position and an elevated and articulated bowl opening position; the scraper having a forwardly moving actuating part, and said last named means including a cam lever adapted to be engaged upon forward movement of said part, whereby to cause downward swinging movement of the apron top plate.

3. In a carrying scraper which includes a bowl having an initially open front end portion, and a front apron unit mounted for movement between open and closed positions relative to said open front end portion; the front apron unit including transversely extending top and bottom plates, means pivotally mounting the top plate for swinging movement about a transverse axis adjacent its upper edge, the top and bottom plates being hinged along adjacent edges for forward articulation, a tension spring connected between the top plate of the apron unit and an elevated point on the scraper whereby to urge the apron unit to an elevated and articulated bowl opening position, and means mounted in part in connection with said top plate operative to swing the apron unit to a downwardly extended bowl closing position.

4. In a carrying scraper which includes a bowl having an initially open front end portion, and a front apron unit mounted for movement between open and closed positions relative to said open front end portion; the front apron unit including transversely extending top and bottom plates, means pivotally mounting the top plate for swinging movement about a transverse axis adjacent its upper edge, the top and bottom plates being hinged along adjacent edges for forward articulation, a tension spring connected between the top plate of the apron unit and an elevated point on the scraper whereby to urge the apron unit to an elevated and articulated bowl opening position, and means mounted in part in connection with said top plat operative to swin the apron unit to a downwardly extended bowl closing position; said last named means including a forwardly moving actuating part on the scraper.

5. A scraper having an apron unit as in claim 4 in which said part mounted in connection with the top plate comprises a cam lever; said forwardly moving actuatin part being positioned to engage and operate said cam lever.

6, In a carrying scraper which includes a bowl having an initially open front end portion, and a front apron unit mounted for movement between open and closed positions relative to said open front end portion; the front apron unit including transversely extending top and bottom plates, a rotatably mounted cross shaft fixed on the top plate in supporting relation thereto, a cam lever on one end of the shaft, the scraper including a forwardly moving actuating part positioned to engage the cam lever and rotate the shaft in a direction to swing the apron top plate toward the bowl, the top and bottom plates being hinged together along adjacent edges for forward articulation, and means connected to the apron unit operative to swing the top plate away from the bowl.

PAUL ZAKEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 140,175 Warren June 24, 1873 872,439 Livengood Dec. 3, 1907 2,105,320 Heil Jan, 11, 1938 1,189,222 'Rapp Feb. 6, 1940 2,216,235 French Oct. 1, 1940 2,329,841 Ferguson Sept. 21, 1943 2,344,313 Lichtenberg Mar. 14, 1944 2,345,313 Armington et al. Mar, 28, 1944 2,353,120 Austin July 11, 1944 2,383,978 Le 'Iourneau Sept. 4, 1945 

